6
Section II
–
Description
A. General
CM2 and CM3 Series -20/-30 Design Valves are made up of
directional control valve sections mounted in banks and
connected internally to common pressure and tank return
passages. A valve bank usually consists of an inlet and
operating (R*, F*, or K*), a number of operating sections (*)
and an operating and outlet section (*L or *E). Each
operating section contains a sliding spool (for example B, C,
D or T Spool). In valve banks where only one operating
section is required, an R* section is used with an L or E tank
plate section.
B. Assembly and Construction
Figure 1 is a cross-sectional view showing the construction
and assembly of a three-section valve. Each section
normally contains a sliding spool with centering springs and
a check valve. The inlet section also contains a relief valve
assembly.
Passages between the bodies connect each section to the
common inlet and tank ports. Seal rings between the
sections seal the connecting passages. Sections are held
together by studs and nuts.
C. Detent Features
1.
Spool Detents
- A spool detent assembly consists
of a special end cap with a spring loaded plunger and a
spool extension. The plunger engages in grooves of the
spool extension to hold the spool in the desired position
(see Figure 9).
D. Mounting
CM2 and CM3 Series -20/-30 Design Valves have mounting
lugs cast into the inlet and outlet sections.
E. Installation Drawing
Vickers Mobile Hydraulics Division application engineers
should be consulted for valve ratings and applications.
(Refer to the installation drawing listed in Table 1 for the
performance information.)
Figure 1.
Center Body
Check
Valve
Inlet Body
Relief Valve
Tie Stud
Spool
Outlet Body
Seal
Rings
